1820405 - CSS :hover briefly removed on mouse down (Linux)

Status: RESOLVED FIXED

(Core :: DOM: UI Events & Focus Handling, defect)

Description

[Matthew Woodcraft]

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/110.0

Steps to reproduce:

Visited the :hover example page at
https://developer.mozilla.org/en-US/docs/Web/CSS/:hover

Hovered over the "Confirm" button in the example, then left-clicked with my
mouse.

Actual results:

The button briefly shows in non-hover: state after the start of the click.

Expected results:

The button should remain continuously in hover:state

Comment 1

[Matthew Woodcraft]

This breaks one style of CSS-based dropdown menus, because the menu disappears
before clicking on the link takes effect.

For example, this page shows the problem:
https://www.htmldog.com/articles/suckerfish/dropdowns/example/bones1.html

Observed in 110.0.1 (as distributed from www.mozilla.org), with a clean profile, running under Debian 11.6 .

I don't see the misbehaviour in Firefox 1.02 ESR (as distributed by Debian).

I believe the misbehaviour is not present for Firefox on Windows.

This breaks one style of CSS-based dropdown menus, because the menu disappears before clicking on the link takes effect.

For example, this page shows the problem:
https://www.htmldog.com/articles/suckerfish/dropdowns/example/bones1.html

Comment 2

[BugBot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug should belong to the 'Core::DOM: UI Events & Focus Handling' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Comment 3

[Emilio Cobos Álvarez (:emilio)]

Which window manager are you using etc? Can you attach your about:support?

We've seen something similar in some old WMs, but it's a WM bug it seems, see bug 1807482

Comment 4

[Matthew Woodcraft]

Attachment: about:support text

about:support as requested

Comment 5

[Matthew Woodcraft]

I'm using X11 with qtile as the window manager.

Comment 6

[Emilio Cobos Álvarez (:emilio)]

If you go to about:config, change widget.gtk.ignore-bogus-leave-notify from 2 to 1, and restart, is it fixed?

Comment 7

[Matthew Woodcraft]

Yes, that fixes it.

Comment 8

[Emilio Cobos Álvarez (:emilio)]

Attachment: Bug 1820405 - Ignore bogus enter-leave by default in lg3d/qtile. r=stransky

Comment 9

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/18b79e01feb3
Ignore bogus enter-leave by default in lg3d/qtile. r=stransky

Comment 10

[Cristian Tuns]

https://hg.mozilla.org/mozilla-central/rev/18b79e01feb3

Comment 11

[Ardelean Oana, Desktop Test Engineering [:oardelean]]

I could not reproduce this issue on my end on a 2023-03-14 Nightly build on Ubuntu 22.
Matthew, would you be so kind as to confirm the fix on the latest RC build?
Thank you.

Comment 12

[Matthew Woodcraft]

I've checked with that build and a clean profile, and I don't see the problem any more.

Thank you.